Felicia is married to a timid man. She has an affair with Roger who is fitter, stronger more of a man than her husband.
Never underestimate what a man is capable of.
I did not read this in one sitting but nibbled at it all day. It is so well written that I kept thinking about it as I was working around the house. The characters and situation were fresh; Roger's confidence and arrogance - made me dislike him intensely.